Frontier Airlines' cancellation policy is generally non-refundable, but it offers options for refunds or travel credits depending on the fare type, timing of the cancellation, and the reason. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) 

For voluntary cancellations

• Basic Fare: There is a cancellation fee, which is highest closer to the departure date. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) If you cancel, the value of your ticket (minus the fee) is converted into a travel credit for future use.
• 60+ days before departure: $0 fee.
• 59 to 7 days before departure: $49 fee.
• 6 days or less before departure: $99 fee.
• Bundles (Economy, Premium, Business): For tickets purchased with one of these bundles, there is no cancellation fee. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) If you cancel, you will receive a travel credit for the value of the itinerary.
• Elite Status: Elite status members receive free changes and cancellations, regardless of the fare type. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) Diamond-level members can get a refund to the original form of payment.
• 24-Hour Rule: You can receive a full refund to your original payment method if you cancel within 24 hours of booking, as long as the flight is scheduled for at least seven days away.